#Ancestral - Derived Traits
#Mono-, Para-, Poly-phyletic Groups
#Convergent Evolution
#Ancestral - Derived Traits
#Mono-, Para-, Poly-phyletic Groups
#Convergent Evolution
Each tree is a hypothesis about the most likely path of evolution based on the data available
Length of branch represents evolutionary time from a common ancestor (units can vary)
Aquatic mammals are a large polyphyletic group in the mammal phylogeney